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@(#)rsh.1 8.1 (Berkeley) 6/6/93
$FreeBSD: stable/10/usr.bin/rsh/rsh.1 320646 2017-07-04 15:53:54Z allanjude $
.Dd July 3, 2017 .Dt RSH 1 .Os .Sh NAME .Nm rsh .Nd remote shell .Sh SYNOPSIS .Nm .Op Fl 46dn .Op Fl l Ar username .Op Fl t Ar timeout .Ar host .Op command .Sh DEPRECATION NOTICE .Nm is deprecated and will be removed from future versions of the .Fx base system. If .Nm is still required, it can be installed from ports or packages (net/bsdrcmds). .Sh DESCRIPTION The .Nm utility executes .Ar command on .Ar host .
p The .Nm utility copies its standard input to the remote command, the standard output of the remote command to its standard output, and the standard error of the remote command to its standard error. Interrupt, quit and terminate signals are propagated to the remote command; .Nm normally terminates when the remote command does. The options are as follows: l -tag -width flag t Fl 4 Use IPv4 addresses only. t Fl 6 Use IPv6 addresses only. t Fl d Turn on socket debugging (using .Xr setsockopt 2 ) on the .Tn TCP sockets used for communication with the remote host. t Fl l Ar username Allow the remote .Ar username to be specified. By default, the remote username is the same as the local username. Authorization is determined as in .Xr rlogin 1 . t Fl n Redirect input from the special device
a /dev/null (see the .Sx BUGS section of this manual page). t Fl t Ar timeout Allow a .Ar timeout to be specified (in seconds). If no data is sent or received in this time, .Nm will exit. .El
p If no .Ar command is specified, you will be logged in on the remote host using .Xr rlogin 1 .
p Shell metacharacters which are not quoted are interpreted on local machine, while quoted metacharacters are interpreted on the remote machine. For example, the command
p .Dl rsh otherhost cat remotefile >> localfile
p appends the remote file .Ar remotefile to the local file .Ar localfile , while
p .Dl rsh otherhost cat remotefile ">>" other_remotefile
p
appends
.Ar remotefile
to
.Ar other_remotefile .
.Pp
Many sites specify a large number of host names as commands in the
directory /usr/hosts.
If this directory is included in your search path, you can use the
shorthand ``host command'' for the longer form ``rsh host command''.
.Sh FILES
l -tag -width /etc/hosts -compact t Pa /etc/hosts .El
.Sh SEE ALSO
.Xr rlogin 1 ,
.Xr setsockopt 2 ,
.Xr rcmd 3 ,
.Xr ruserok 3 ,
.Xr hosts 5 ,
.Xr hosts.equiv 5 ,
.Xr rlogind 8 ,
.Xr rshd 8
.Sh HISTORY
The
.Nm
command appeared in
x 4.2 . .Sh BUGS
If you are using
.Xr csh 1
and put a
.Nm
in the background without redirecting its input away from the terminal,
it will block even if no reads are posted by the remote command.
If no input is desired you should redirect the input of
.Nm
to
a /dev/null using the .Fl n option.
p You cannot run an interactive command (like .Xr ee 1 or .Xr vi 1 ) using .Nm ; use .Xr rlogin 1 instead.
p Stop signals stop the local .Nm process only; this is arguably wrong, but currently hard to fix for reasons too complicated to explain here.